JPH025657Y2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention (1) Industrial application field The present invention relates to a mounting structure for a cooling fan in a rotating electric machine such as a motor generator.

(2) Prior art The above-mentioned mounting structure includes, for example, a rotating shaft J on which a rotor 13 is mounted, as shown in FIGS. 3 and 4.
, a cooling fan 019 having a center hole 23 with an inner diameter larger than the outer diameter of the end of the rotating shaft J, and a fitting protrusion 2 fitted into the center hole 23 from one side thereof.
6 and abuts against one side of the inner peripheral portion of the cooling fan 019; and a fitting protrusion 27 that is fitted into the center hole 23 from the other side.
a second support member 025 that integrally has a second support member 025 that abuts against the other side of the inner peripheral portion of the cooling fan 019, and both of the support members 024, 025, whose fitting protrusions 26, 27 abut each other. In addition, in order to tighten the support member 025 together with the rotation shaft J with the back surface of the support member 025 abutting against the end surface of the rotation shaft J, the head part engages with the back surface of the other support member 024 and the shaft portion is A conventionally known device includes a mounting bolt 15 that passes through both the fitting protrusions 26 and 27 and is screwed onto the rotating shaft J.

In such a conventionally known structure, even if the inner diameter of the center hole 23 of the cooling fan 019 is larger than the outer diameter of the end of the rotating shaft J, the supporting members 024 and 025 are not connected to the end of the rotating shaft J. cooling fan 019
It has the advantage that it can be bolted on without any trouble.
In particular, the first and second support members 024, 02
The fitting protrusions 26 and 27 of No. 5 that abut each other function as spacers that maintain a constant distance between the cooling fan clamping surfaces of both support members 024 and 025, so the mounting bolts 15 are strongly tightened. Even if it is tightened, the tightening torque is
Therefore, it is effective in preventing damage to the cooling fan 019, which is generally molded from synthetic resin with relatively low strength.

However, in the structure described above, the cooling fan 01
Since the tightening torque of the mounting bolt 15 is not transmitted to the cooling fan 019 and the rotating shaft J, it is necessary to provide a rotation preventing means between the cooling fan 019 and the rotating shaft J. Therefore, in the above-mentioned conventionally known structure, in order to prevent the rotation, an engagement hole h formed in one support member 024 is fitted into a cylindrical protrusion p protruding from one surface of the cooling fan 019 so as to be freely inserted and removed. I try to let them do it.

(3) Problems to be Solved by the Invention In the conventionally known structure described above, before tightening the mounting bolt 15 during assembly, one of the engaging holes h and the protrusion p is set in advance to maintain the fitted state. It is necessary to apply the support member 024 to one side of the cooling fan 019 and to keep the other support member 025 in contact with the other side of the cooling fan 019 in a fixed position. In particular, with respect to one of the support members 024, if it is spaced from one side of the cooling fan 019 by more than the height of the protrusion p, the worker must do the tightening work with one hand.
Since the fitted state between the and the engagement hole h is immediately released, and it is necessary to align and fit them together again, it is necessary to press one of the support members 024 against one side of the cooling fan 019 with some force. This makes the work even more troublesome.

The present invention was proposed in view of the above circumstances, and an object of the present invention is to provide a mounting structure for a cooling fan in a rotating electrical machine that can solve all of the above conventional problems.

B. Structure of the invention (1) Means for solving the problem In order to achieve the above-mentioned object, the present invention provides a rotating shaft on which a rotor is attached, and a center of an inner diameter larger than the outer diameter of the end of this rotating shaft. a synthetic resin cooling fan having a hole; a first support member that integrally has a fitting protrusion that is fitted into the center hole from one side thereof and abuts against one side of the inner peripheral portion of the cooling fan; A second portion integrally having a fitting protrusion that is fitted into the center hole from the other side and abuts against the other side of the inner circumference of the cooling fan.
A support member and both support members are fastened together to the rotating shaft with their fitting protrusions abutting each other and the back surface of one support member abutting the end face of the rotating shaft. and a mounting bolt whose head part engages with the back surface of the other support member and whose shaft part passes through both of the fitting protrusions and is screwed onto the rotating shaft. In the structure, each of the opposing surfaces of the first and second support members on both sides of the inner circumferential portion of the cooling fan is provided with a support member that engages with an engagement hole formed in the corresponding support member. It is characterized by integrally provided with an elastic locking protrusion that is fixed to the cooling fan.

(2) Effect When installing the cooling fan, the first and second support members can be temporarily fixed to the cooling fan by engaging the engagement holes with the elastic locking protrusions in advance. It is no longer necessary to manually hold each support member on the cooling fan when tightening the mounting bolts as in the past.

Moreover, after assembly, the engagement between the elastic locking protrusion and the engagement hole reliably restricts the relative rotation of the cooling fan with respect to the support member and, in turn, the rotating shaft.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, in FIG. , 4, both covers 3 and 4 are integrally connected by bolts 7 so as to sandwich the annular core 6 of the stator 5 from both sides.The first cover 3 is integrally connected to the crankcase 8 of the engine E. be done. A coil 9 is wound around the annular core 6 within the housing 2, thereby forming a starter 5.

The crankcase 8 is integrally provided with a boss portion 10 that protrudes into the first cover 3, and a crankshaft 12 is rotatably supported by the boss portion 10 by a bearing 11. The end of the crankshaft 12 is inserted into the housing 2, and this crankshaft 1
A rotor 13 is attached to the end of 2.

That is, a cylindrical rotor shaft 14 is tapered fitted to the end of the crankshaft 12, and the shaft end of a mounting bolt 15 passing through the rotor shaft 14 is screwed into the end of the crankshaft 12 and tightened. As a result, the rotor shaft 14 is integrally coupled to the crankshaft 12. Therefore, the rotor shaft 14 and the crankshaft 1
2 constitutes the rotation axis J of the present invention.

An iron core 16 is fixed to the rotor shaft 14, and a coil 1 is connected to the iron core 16 via a bobbin 17.
The rotor 13 is constructed by winding the rotor 8.

A cooling fan 19 is attached to the end of the rotor shaft 14 protruding from the rotor 13 using the attachment bolts 15. The cooling fan 19 is molded from synthetic resin, and includes a bottomed cylindrical mounting portion 22 integrally connected to the inner peripheral edge of a disc portion 21 having a plurality of blades 20. A circular central hole 23 having an inner diameter larger than the outer diameter of the end of the rotor shaft 14 is bored in the center.

Referring also to FIG. 2, first and second support members 24 and 25 abut each other on both sides of the inner peripheral portion of the cooling fan 19, that is, on both bottomed sides of the mounting portion 22. The mounting portion 22 is disposed so as to sandwich the mounting portion 22 therebetween. These support members 24,2
5 is basically formed in the shape of a disk, and integrally formed in the center thereof are dish-shaped fitting protrusions 26 and 27 that fit into the center hole 23 of the cooling fan 19 from both sides and abut against each other. established in Furthermore, the fitting protrusions 26 and 27 are provided with insertion holes 28 and 29 through which the mounting bolts 15 are inserted.

In order to attach each of the support members 24 and 25 to the cooling fan 19, on both sides of the inner peripheral portion of the cooling fan 19, that is, on both sides of the mounting portion 22, on the surfaces facing the support members 24 and 25, A pair of elastic locking protrusions 30 and 31 are provided to protrude, respectively. These locking protrusions 30, 31 have enlarged heads 30a,
It is formed by dividing the protrusion having the shape 31a into two to impart elasticity. In addition, each support member 2
4 and 25, at positions corresponding to the locking projections 30 and 31, a pair of engagements for engaging with the locking projections 30 and 31 to fix each support member 24 and 25 to the fan 19. Holes 32 and 33 are bored, respectively.

The first and second support members 24 and 25 are
The fitting protrusions 26 and 27 are brought into contact with each other, and the back surface of the second support member 25 is connected to the rotor shaft 14.
The rotor shaft 14 is set on the shaft end of the rotor shaft 14 in such a state that it abuts against the end surface of the rotor shaft 14. In the set state, the mounting bolt 15 has its head 15a inserted into the first position through the washer 34.
It engages with the back surface of the support member 24, and its shaft portion 15b is inserted into the insertion hole 2 of both support members 24, 25.
8 and 29 and is screwed into the end of the crankshaft 12. By tightening this mounting bolt 15, both support members 24, 25 are attached to the rotor shaft 14.
and the head 15a of the mounting bolt 15, and the cooling fan 19 is fixed to the end of the rotor shaft 14.

In the housing 2, a ventilation hole 35 is formed in the first cover 3 in order to introduce cooling air into the housing 2 by the operation of the cooling fan 19.
The second cover 4 is provided with a ventilation hole 36 for exhausting air from inside the housing 2.

Next, the operation of this embodiment will be described. When attaching the cooling fan 19 to the rotor shaft 14, first each support member 24, 25 is attached to the cooling fan 19. That is, by inserting the locking projections 30, 31 of the cooling fan 19 into the engagement holes 32, 33, the enlarged heads 3 of the locking projections 30, 31
0a and 31a engage with the opening edges of the engagement holes 32 and 33, and thereby the support members 24 and 25 are attached to sandwich the cooling fan 19 from both sides. After that, the washer 34 and the insertion hole 28,
29, and then insert the mounting bolt 15 inserted into the rotor shaft 14 into the crankshaft 12.
By screwing and tightening the cooling fan 19
Attachment to the rotor shaft 14 is completed. At this time, since both support members 24 and 25 are temporarily fixed to the cooling fan 19 in advance before tightening the mounting bolts 15, it is necessary to specially hold the support members 24 and 25 to the cooling fan 19 by hand. This makes installation work easier.

Further, after assembly, the support member 2
4, 25, and thus the relative rotation of the cooling fan 19 with respect to the rotor shaft 14 can be reliably regulated.

C. Effects of the invention As described above, according to the invention, there is provided a rotating shaft on which a rotor is attached, a synthetic resin cooling fan having a central hole with an inner diameter larger than the outer diameter of the end of the rotating shaft, and a first support member that integrally has a fitting protrusion that is fitted into the hole from one side thereof and abuts one side of the inner peripheral portion of the cooling fan; and a first support member that is fitted into the center hole from the other side. a second support member integrally having a protrusion and abutting against the other side of the inner circumferential portion of the cooling fan; and one support member having the fitting protrusions of the two support members abutting each other; The head part engages with the back surface of the other support member, and the shaft part passes through both of the fitting protrusions, so that the support member is fastened together with the rotating shaft with its back surface abutting against the end surface of the rotating shaft. In the mounting structure for a cooling fan in a rotating electric machine, the mounting bolt is screwed onto the rotating shaft.
Each of the surfaces facing the first and second support members is integrally provided with an elastic locking protrusion that engages with an engagement hole formed in the corresponding support member and fixes the support member to the cooling fan. Therefore, when installing the cooling fan, the first and second support members can be temporarily fixed to the cooling fan by engaging the engagement holes with the elastic locking protrusions in advance. It is no longer necessary to manually hold each support member on the cooling fan when tightening the mounting bolts, making the overall work much easier and greatly contributing to improving work efficiency. Moreover, after assembly, the engagement between the elastic locking protrusion and the engagement hole reliably restricts the relative rotation of the cooling fan with respect to the support member and, in turn, the rotating shaft. As described above, the locking protrusion and the engagement hole can be used both as means for temporarily fixing the support member to the cooling fan and as means for preventing rotation of the cooling fan against the rotating shaft, which simplifies the structure accordingly. This can contribute to cost reduction.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is an overall vertical sectional view, FIG. 2 is an exploded perspective view showing the main parts on an enlarged scale, and FIGS. 3 and 4 are views of a conventional example. FIG. 2 is a cross-sectional view and a perspective view corresponding to FIG. 1 and FIG. 2, respectively. 1...Rotating shaft, 1...Motor generator as rotating electric machine, 13...Rotor, 15...Mounting bolt, 1
5a...head, 15b...shaft, 19...cooling fan, 23...center hole, 24, 25...first, second support members, 26, 27...fitting protrusion, 3
0, 31... Locking protrusion, 32, 33... Engaging hole.

Claims (1)

[Scope of utility model registration request] A rotating shaft J to which the rotor 13 is attached, and a central hole 23 having an inner diameter larger than the outer diameter of the end of the rotating shaft J.
a first support that integrally has a fitting protrusion 26 that is fitted into the center hole 23 from one side thereof and abuts against one side of the inner circumference of the cooling fan 19; a second support member 25 which integrally has a fitting protrusion 27 fitted into the center hole 23 from the other side and abuts against the other side of the inner circumference of the cooling fan 19; and both supports. The members 24 and 25 are connected to their fitting protrusions 2.
6 and 27, the head 15a is attached to the other support member 24 in order to tighten them together on the rotation shaft J with the back surface of one support member 25 abutting the end face of the rotation shaft J. In a mounting structure for a cooling fan in a rotating electric machine, the mounting structure includes a mounting bolt 15 that engages with the back surface and has a shaft portion 15b passing through both of the fitting protrusions 26 and 27 and is screwed onto the rotating shaft J. Engagement holes 32 and 33 formed in the corresponding support members 24 and 25 are provided on both sides of the inner peripheral portion of the cooling fan 19 facing the first and second support members 24 and 25, respectively. A mounting structure for a cooling fan in a rotating electric machine, characterized in that elastic locking protrusions 30 and 31 are integrally provided for fixing the support members 24 and 25 to the cooling fan 19.